CVE-2011-1771

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

The cifs_close function in fs/cifs/file.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (NULL pointer dereference and BUG) or possibly have unspecified other impact by setting the O_DIRECT flag during an attempt to open a file on a CIFS filesystem.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
40.4%
KEV
Not listed

Published

September 6, 2011

Last Modified

April 29, 2026

Advisory Details (5)

Auto-updated May 2, 2026
Patch available. Sources: redhat.
generic

'Re: Repeatable crash in 2.6.38 related to O_DIRECT' - MARC

http://marc.info/?l=linux-cifs&m=130204730006155&w=2
generic

'Repeatable crash in 2.6.38 related to O_DIRECT' - MARC

http://marc.info/?l=linux-cifs&m=130204357001849&w=2
redhat Patch Available

703016 – (CVE-2011-1771) CVE-2011-1771 kernel: cifs oops when creating file with O_DIRECT set

Affected: Red Hat Enterprise Linux 4, 5, and Red Hat Enterprise Linux MRG as they did not backport the upstream commit cdff08e7 that int

https://bugzilla.redhat.com/show_bug.cgi?id=703016
generic

oss-security - CVE-2011-1771 kernel: cifs oops when creating file with O_DIRECT set

http://www.openwall.com/lists/oss-security/2011/05/09/2
generic

linux kernel 2.6.38 related to O_DIRECT crash - CXSecurity.com

http://securityreason.com/securityalert/8367

Vendor Advisories for CVE-2011-1771(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-2.6.38-10-generic (2.6.38-10.46) @ natty2026-05-29ubuntu
ubuntulinux-image-2.6.38-1209-omap4 (2.6.38-1209.15) @ natty2026-05-29ubuntu
ubuntulinux-image-2.6.38-12-generic (2.6.38-12.51~lucid1) @ lucid2026-05-29ubuntu
redhatkernel-0:2.6.32-131.2.1.el62011-06-01redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 16:54 UTCEPSS rescore
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  48. 2026-05-29 07:06 UTCEG score recompute
  49. 2026-05-29 07:06 UTCVendor advisory
  50. 2026-05-29 07:06 UTCGHSA enrichment
  51. 2026-05-28 13:42 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2011-1771?
CVE-2011-1771 is a high vulnerability published on September 6, 2011. The cifsclose function in fs/cifs/file.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (NULL pointer dereference and BUG) or possibly have unspecified other impact by setting the ODIRECT flag during an attempt to open a file on a CIFS filesystem.
When was CVE-2011-1771 disclosed?
CVE-2011-1771 was first published in the National Vulnerability Database on September 6, 2011, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-1771 actively exploited?
CVE-2011-1771 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2011-1771?
CVE-2011-1771 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2011-1771?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-1771, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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